#4315 NORM Never A: Cleaning up the custom paint tool cursors

[Zarro Boogs per Child]

#4315: Cleaning up the custom paint tool cursors
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 Reporter:  Eben                              |       Owner:  alexandre     
     Type:  defect                            |      Status:  new           
 Priority:  normal                            |   Milestone:  Never Assigned
Component:  paint/drawing-activity (oficina)  |     Version:                
 Keywords:                                    |    Verified:  0             
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 I like the use of the custom shapes for various paint tools for indicating
 the selected tool, however they aren't actually that useful as cursors.

 These should instead be implemented as modified cursors, which "badge" the
 cursor with the shape or tool icon but retain the pointing head of the
 arrow.  This will provide a more seamless experience and allow for a bit
 more precision with the tools.

 Please see "gtk_drag_get_cursor" for examples.  The summary of how to do
 this is to retrieve the graphic for "left_cursor_modify" from the theme,
 composite the image for the tool, and then set the cursor.

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Ticket URL: <https://dev.laptop.org/ticket/4315>
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